2991847 has 4 divisors (see below), whose sum is σ = 3167856. Its totient is φ = 2815840.

The previous prime is 2991803. The next prime is 2991853. The reversal of 2991847 is 7481992.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2991847 - 2⁷ = 2991719 is a prime.

It is a super-2 number, since 2×2991847² = 17902296942818, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87979 + ... + 88012.

It is an arithmetic number, because the mean of its divisors is an integer number (791964).

2^2991847 is an apocalyptic number.

2991847 is a deficient number, since it is larger than the sum of its proper divisors (176009).

2991847 is a wasteful number, since it uses less digits than its factorization.

2991847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176008.

The product of its digits is 36288, while the sum is 40.

The square root of 2991847 is about 1729.6956379664. The cubic root of 2991847 is about 144.0941867096.

The spelling of 2991847 in words is "two million, nine hundred ninety-one thousand, eight hundred forty-seven".